Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-insecurity mechanisms？（）
- A、Frame Relay
- B、HDLC
- C、x.25
- D、PPP
正确答案:D
答案解析:有
微信扫一扫手机做题
多做题，通过考试没问题！
思科认证考试
思科认证考试
Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-insecurity mechanisms？（）
微信扫一扫手机做题